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首页> 美国政府科技报告 >Copper in the Sea: A Physical--Chemical Study of Reservoirs, Fluxes, and Pathways in an Alaskan Fjord
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Copper in the Sea: A Physical--Chemical Study of Reservoirs, Fluxes, and Pathways in an Alaskan Fjord

机译：海洋中的铜：阿拉斯加峡湾水库，通量和通路的物理化学研究

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Copper in the sea is derived principally from continental weathered products added to the oceans at continental boundaries; hence processes, fluxes, and pathways in estuaries control the supply of copper to the marine biosphere. From mass balances, the fluxes, sources, and sinks of copper in an Alaskan fjord were examined by utilizing fjord deep waters as an approximation to a closed chemical system. Copper was measured in the water columns and interstitial waters electroanalytically. Concentrations of soluble copper ranged between 0.14 mu g l exp -1 and 3.13 mu g l exp -1 . Approximately 40% of total copper was associated with particulate matter in the water column. Concentrations of copper in interstitial waters varied between 1.02 and 9.98 mu g l exp -1 ; maximum concentrations were always found in surface segments. Concentrations of copper on sediments were about 20 mg kg exp -1 . Copper was removed from the water column and transported to the sediments by particulate matter; net annual removal was estimated to be between 9.6 and 14.2 mu g Cu cm exp -2 . Copper was remobilized from the solid phase(s) in surface sediments and subsequently returned to the overlying water; net annual transport across the sediment-seawater interface was estimated to be 1.9 mu g Cu cm exp - 2. Therefore, between 13 and 20% of copper removed from the water column to the sediments was returned to the water column. Remobilized copper not returned to the water column was removed from interstitial waters in the anoxic zone of sediments. Remobilization and removal processes in sediments take place in thin approx. 10 cm zone and effective rates of reactions in sediments may be one of three orders of magnitude greater than reaction rates in the water column. A hypothesis is presented for transport of copper to the sediments predominately on biogenic particles. (ERA citation 04:047423)

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